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Related Experiment Video

Updated: May 17, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

Electronic transmittance phase extracted from mesoscopic interferometers.

M Tolea¹, V Moldoveanu, Iv Dinu

¹, National Institute of Materials Physics, P, O, Box MG-7, Bucharest-Magurele 77125, Romania. tzolea@infim.ro.

Nanoscale Research Letters

|October 16, 2012

Summary

This summary is machine-generated.

Closed interferometers reveal quantum dot (QD) transmittance phase lapses. Phase lapses correlate with Fano parameters, offering insights into electron wave function behavior in mesoscopic systems.

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Area of Science:

Quantum physics
Mesoscopic physics
Condensed matter physics

Background:

Traditional 'open' interferometers measure quantum dot (QD) transmittance phase shifts but have drawbacks like reduced signal and lead effects.
Open interferometers use additional leads to absorb back-scattered electrons, simplifying phase extraction but introducing uncertainties.

Purpose of the Study:

To theoretically investigate quantum dot (QD) transmittance phase shifts in 'closed' interferometers.
To analyze the relationship between phase lapses and Fano parameters in mesoscopic systems.

Main Methods:

Theoretical analysis combining existing literature data and new proofs.
Numerical simulations to validate analytical findings.
Investigation of electron tunneling through a QD embedded in a ring structure.

Main Results:

Phase lapses between consecutive QD resonances are linked to the signs of Fano parameters of the QD+ring system.
A "Π" phase lapse occurs when Fano parameters share the same sign.
Closed interferometers provide a method to study the 'universal phase lapse' phenomenon.

Conclusions:

Closed mesoscopic interferometers are suitable for studying universal phase lapses.
Existing Fano interference experimental data can be used to infer phase lapses.
The study clarifies the role of Fano parameters in quantum phase shifts.